阅读说明：本技术 一种二次eva模内压底片材料及其一次成型方法 (Secondary EVA (ethylene-vinyl acetate copolymer) in-mold pressing negative material and one-step forming method thereof ) 是由 杨道丰 于 2020-06-09 设计创作，主要内容包括：本发明实施例公开了一种二次EVA模内压底片材料及其一次成型方法,按重量份数计包括如下组分：乙烯醋酸乙烯共聚物3-6份,氧磺化聚乙烯橡胶32-37份,热塑性弹性体26-29份,纳米碳酸钙4-7份,白炭黑21-24份,润滑剂2-6份,钛白粉1-3份,色母粒0.01-2份。乙烯醋酸乙烯共聚物、氧磺化聚乙烯橡胶、热塑性弹性体复配而成的高分子材料克服传统EVA底片材料低温性能差以及不耐磨缺点,还进一步提高了鞋底的防滑性、强度、弹性、耐腐蚀等性能,具有可塑性,可在不破坏原有结构基础上,进行二次加工成形,使该二次EVA模内压底片材料可重复使用,节省了资源,减少了环境污染；该EVA模内压底片材料可在模腔内一次成型达成侧面双色效果,减少工序,降低人工成本。(The embodiment of the invention discloses a secondary EVA (ethylene vinyl acetate copolymer) in-mold pressing negative film material and a one-step forming method thereof, wherein the secondary EVA in-mold pressing negative film material comprises the following components in parts by weight: 3-6 parts of ethylene-vinyl acetate copolymer, 32-37 parts of oxysulfonated polyethylene rubber, 26-29 parts of thermoplastic elastomer, 4-7 parts of nano calcium carbonate, 21-24 parts of white carbon black, 2-6 parts of lubricant, 1-3 parts of titanium dioxide and 0.01-2 parts of color master batch. The high polymer material compounded by the ethylene-vinyl acetate copolymer, the oxysulfonated polyethylene rubber and the thermoplastic elastomer overcomes the defects of poor low-temperature performance and non-wear resistance of the traditional EVA bottom sheet material, further improves the performances of skid resistance, strength, elasticity, corrosion resistance and the like of the sole, has plasticity, can be subjected to secondary processing forming on the basis of not damaging the original structure, ensures that the secondary EVA mold internal pressing bottom sheet material can be repeatedly used, saves resources and reduces environmental pollution; the EVA die internal pressing negative material can be formed in the die cavity at one time to achieve the side double-color effect, so that the working procedures are reduced, and the labor cost is reduced.)

1. The secondary EVA die pressing negative film material is characterized by comprising the following components in parts by weight:

3-6 parts of ethylene-vinyl acetate copolymer, 32-37 parts of oxysulfonated polyethylene rubber, 26-29 parts of thermoplastic elastomer, 4-7 parts of nano calcium carbonate, 21-24 parts of white carbon black, 2-6 parts of lubricant, 1-3 parts of titanium dioxide and 0.01-2 parts of color master batch.

2. The secondary EVA in-mold pressure backsheet material of claim 1, wherein the thermoplastic elastomer is any one of TPE, PVC, TPR material.

3. The secondary EVA in-mold pressing backsheet material of claim 1, which comprises the following components in parts by weight:

3 parts of ethylene-vinyl acetate copolymer, 32 parts of oxysulfonated polyethylene rubber, 26 parts of thermoplastic elastomer, 4 parts of nano calcium carbonate, 21 parts of white carbon black, 2 parts of lubricant, 1 part of titanium dioxide and 0.01 part of color master batch.

4. The secondary EVA in-mold pressing backsheet material of claim 1, which comprises the following components in parts by weight:

4 parts of ethylene-vinyl acetate copolymer, 35 parts of oxysulfonated polyethylene rubber, 28 parts of thermoplastic elastomer, 6 parts of nano calcium carbonate, 22 parts of white carbon black, 4 parts of lubricant, 1.5 parts of titanium dioxide and 0.5 part of color master batch.

5. The secondary EVA in-mold pressing backsheet material of claim 1, which comprises the following components in parts by weight:

6 parts of ethylene-vinyl acetate copolymer, 37 parts of oxysulfonated polyethylene rubber, 29 parts of thermoplastic elastomer, 7 parts of nano calcium carbonate, 24 parts of white carbon black, 6 parts of lubricant, 3 parts of titanium dioxide and 2 parts of color master batch.

6. A one-step molding method for secondary EVA mold pressing of a substrate material according to any one of claims 1 to 5, comprising the steps of:

step 100, banburying: all the components in parts by weight are well distributed and sent into an internal mixer, and the temperature is gradually increased to carry out internal mixing in multiple stages;

step 200, open mixing: carrying out open milling on the internally mixed material for multiple times to reach the preset material thickness;

step 300, granulation: the setting temperature of the material making machine is divided into 4 sections, the first section is at 140-;

step 400, manufacturing a mold and injection molding: manufacturing a negative mold according to product requirements, sending the negative particles into an injection molding machine for negative molding, setting different injection molding machine temperatures according to the structures of different negative molds, wherein the temperature of a spray gun screw of the injection molding machine is segmented into 4 sections, the first section is 150-160 ℃, the second section is 150-160 ℃, the third section is 110-120 ℃, the fourth section is 90-100 ℃, the pressure is 100 Pa, and the temperature is kept for 5 seconds, the injection molding time is 5 seconds, and the cooling time is 10 seconds;

step 500, spraying and coating glue: coating glue on the formed film, spraying the film with a specific treating agent, spraying the glue after drying, and finally compounding the film with a special mold;

step 600, in-mold forming: and putting the processed molding bottom sheet into the bottom of the mold cavity, putting the product made of the upper EVA layer into a flat plate oil pressure vulcanizing machine, setting the operation temperature to be 175-plus-210 ℃, the vulcanizing time to be 250-plus-500 seconds and the cooling time to be 250-plus-450 seconds, and molding at one time in the mold cavity to achieve the side double-color effect.

7. The method for forming a secondary EVA mold internal pressing backsheet material in one step according to claim 5, wherein in step 100, the banburying comprises the following specific operations:

firstly, setting banburying temperature to be 95 ℃, setting banburying time to be 5 minutes, and turning for 1 time;

then, adjusting the banburying temperature to 120 ℃ for 6.5 minutes, and turning for 1 time;

then, adjusting the banburying temperature to 130 ℃ for 7.5 minutes, and turning for 1 time;

finally, adjusting the banburying temperature to 140 ℃ for 10 minutes, and turning over for 1 time.

Technical Field

The embodiment of the invention relates to the technical field of food safety, in particular to a secondary EVA (ethylene vinyl acetate copolymer) in-mold pressing negative material and a one-step forming method thereof.

Background

Shoes made of the EVA soles in the current market are more and more popular with consumers, but the EVA soles in the current market have complex processes and high cost, and the bottom sheets can not be reused; therefore, the EVA shoe sole which has low investment energy consumption, simple process, short processing period, improved production efficiency and low processing cost, particularly, the leftover materials and the old finished products can be recycled after being simply regenerated, thereby saving resources and reducing environmental pollution is urgently needed. The EVA sole is made of EVA bottom sheet material.

However, the manufacturing process of the EVA backsheet material in the prior art has the following defects:

(1) the traditional EVA bottom sheet material has the defects of poor low-temperature performance and poor wear resistance;

(2) the traditional EVA bottom sheet material can not be reused, thereby causing great waste;

(3) and the traditional EVA film material cannot achieve the side surface one-step forming effect, needs manual fitting and has high labor cost.

Disclosure of Invention

Therefore, the embodiment of the invention provides a secondary EVA (ethylene vinyl acetate) in-mold pressing negative material and a one-step forming method thereof, which aim to solve the problems of poor low-temperature performance, poor wear resistance and incapability of secondary utilization of the traditional EVA negative material.

In order to achieve the above object, an embodiment of the present invention provides the following:

a secondary EVA die internal pressing negative film material comprises the following components in parts by weight:

3-6 parts of ethylene-vinyl acetate copolymer, 32-37 parts of oxysulfonated polyethylene rubber, 26-29 parts of thermoplastic elastomer, 4-7 parts of nano calcium carbonate, 21-24 parts of white carbon black, 2-6 parts of lubricant, 1-3 parts of titanium dioxide and 0.01-2 parts of color master batch.

In a preferred embodiment of the present invention, the thermoplastic elastomer is any one of TPE, PVC and TPR.

As a preferable scheme of the invention, the paint comprises the following components in parts by weight:

3 parts of ethylene-vinyl acetate copolymer, 32 parts of oxysulfonated polyethylene rubber, 26 parts of thermoplastic elastomer, 4 parts of nano calcium carbonate, 21 parts of white carbon black, 2 parts of lubricant, 1 part of titanium dioxide and 0.01 part of color master batch.

As a preferable scheme of the invention, the paint comprises the following components in parts by weight:

4 parts of ethylene-vinyl acetate copolymer, 35 parts of oxysulfonated polyethylene rubber, 28 parts of thermoplastic elastomer, 6 parts of nano calcium carbonate, 22 parts of white carbon black, 4 parts of lubricant, 1.5 parts of titanium dioxide and 0.5 part of color master batch.

As a preferable scheme of the invention, the paint comprises the following components in parts by weight:

6 parts of ethylene-vinyl acetate copolymer, 37 parts of oxysulfonated polyethylene rubber, 29 parts of thermoplastic elastomer, 7 parts of nano calcium carbonate, 24 parts of white carbon black, 6 parts of lubricant, 3 parts of titanium dioxide and 2 parts of color master batch.

The invention also provides a one-step forming method of the secondary EVA die internal pressing negative material, which comprises the following steps:

step 100, banburying: all the components in parts by weight are well distributed and sent into an internal mixer, and the temperature is gradually increased to carry out internal mixing in multiple stages;

step 200, open mixing: carrying out open milling on the internally mixed material for multiple times to reach the preset material thickness;

step 300, granulation: the setting temperature of the material making machine is divided into 4 sections, the first section is at 140-;

step 400, manufacturing a mold and injection molding: manufacturing a negative mold according to product requirements, sending the negative particles into an injection molding machine for negative molding, setting different injection molding machine temperatures according to the structures of different negative molds, wherein the temperature of a spray gun screw of the injection molding machine is segmented into 4 sections, the first section is 150-160 ℃, the second section is 150-160 ℃, the third section is 110-120 ℃, the fourth section is 90-100 ℃, the pressure is 100 Pa, and the temperature is kept for 5 seconds, the injection molding time is 5 seconds, and the cooling time is 10 seconds;

step 500, spraying and coating glue: coating glue on the formed film, spraying the film with a specific treating agent, spraying the glue after drying, and finally compounding the film with a special mold;

step 600, in-mold forming: and putting the processed molding bottom sheet into the bottom of the mold cavity, putting the product made of the upper EVA layer into a flat plate oil pressure vulcanizing machine, setting the operation temperature to be 175-plus-210 ℃, the vulcanizing time to be 250-plus-500 seconds and the cooling time to be 250-plus-450 seconds.

As a preferred embodiment of the present invention, in step 100, the banburying specifically comprises:

firstly, setting banburying temperature to be 95 ℃, setting banburying time to be 5 minutes, and turning for 1 time;

then, adjusting the banburying temperature to 120 ℃ for 6.5 minutes, and turning for 1 time;

then, adjusting the banburying temperature to 130 ℃ for 7.5 minutes, and turning for 1 time;

finally, adjusting the banburying temperature to 140 ℃ for 10 minutes, and turning over for 1 time.

The embodiment of the invention has the following advantages:

1. by adopting the technical scheme, the secondary EVA die internal pressing substrate material has good shape without deformation, the side surface has double-color effect and is formed at one time, no later-stage processing is needed, the flexible forming substrate has light weight and good mechanical property, the independent foam structure is provided, and after secondary oil pressure, inner foam holes and foam holes are uniform and have good density, so that the waterproof and heat-insulating properties are good, and the secondary EVA die internal pressing substrate material is suitable for various shoes;

2. the ethylene-vinyl acetate copolymer (EVA) has a closed cell structure, does not absorb water, is moisture-proof and has good water resistance; the rebound resilience and the tensile strength are high, the toughness is high, and the anti-shock and buffering performances are good; the heat insulation, heat preservation and cold protection and low temperature performance are excellent, and the fabric can resist severe cold and insolation;

3. the oxygen sulfonated polyethylene rubber (CSM) has excellent ozone property, atmospheric aging resistance, chemical corrosion resistance and the like, and has better physical and mechanical properties, aging resistance, heat resistance, low temperature resistance, oil resistance, water resistance, flame resistance, wear resistance and electric insulation resistance;

4. the addition of the thermoplastic elastomer (SEBS) enables the negative plate to have excellent aging resistance, plasticity, high elasticity, heat resistance, compression deformation resistance and excellent mechanical properties;

5. the white carbon black is filled to improve the tearing strength of vulcanized rubber and improve the rigidity and hardness of the secondary EVA die inner pressing substrate material;

6. from the above discussion, it can be known that the polymer material compounded by ethylene vinyl acetate copolymer (EVA), oxysulfonated polyethylene rubber (CSM) and thermoplastic elastomer (SEBS) overcomes the disadvantages of poor low-temperature performance and non-wear resistance of the traditional EVA backsheet material, further improves the performances of the sole such as skid resistance, strength, elasticity, corrosion resistance and the like, and is suitable for being used as various high-quality footwear materials;

7. as can be seen from the above discussion, the sole made of the secondary EVA in-mold pressing substrate material has corrosion resistance, stable chemical structure and plasticity, and can be subjected to secondary processing forming on the basis of not damaging the original structure, so that the secondary EVA in-mold pressing substrate material can be repeatedly used, resources are saved, and environmental pollution is reduced;

8. at present, in the traditional EVA sole, one-time forming cannot be realized on the side surface in the one-time forming process in a die cavity, and the double-color effect of the side surface cannot be realized when the side surface is replenished again;

9. the range of the selectable applicable materials is large, and the thermoplastic materials TPE, PVC, TPR and the like which are commonly used in the market can be used in the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a schematic flow chart of a primary molding method of a secondary EVA in-mold pressing backsheet material according to an embodiment of the present invention.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figure 1, the invention provides a secondary EVA die internal pressing backsheet material, which comprises the following components in parts by weight: 3-6 parts of ethylene-vinyl acetate copolymer, 32-37 parts of oxysulfonated polyethylene rubber, 26-29 parts of thermoplastic elastomer, 4-7 parts of nano calcium carbonate, 21-24 parts of white carbon black, 2-6 parts of lubricant, 1-3 parts of titanium dioxide and 0.01-2 parts of color master batch. The thermoplastic elastomer is any one of TPE, PVC and TPR materials.